newlib/winsup/cygwin/math/fdiml.c

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/**
* This file has no copyright assigned and is placed in the Public Domain.
* This file is part of the mingw-w64 runtime package.
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
*/
#include <errno.h>
#include <math.h>
long double
fdiml (long double x, long double y)
{
int cx = fpclassify (x), cy = fpclassify (y);
long double r;
if (cx == FP_NAN || cy == FP_NAN
|| (y < 0 && cx == FP_INFINITE && cy == FP_INFINITE))
return x - y; /* Take care invalid flag is raised. */
if (x <= y)
return 0.0;
r = x - y;
if (fpclassify (r) == FP_INFINITE)
errno = ERANGE;
return r;
}